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Police have released CCTV images of two men they would like to talk to in connection with the incident.

A spokesman for Derbyshire police said: "Witnesses or anyone with information should call PC Qassum Hussain on 101, quoting reference 17000432176. Alternatively, send him a message online by visiting the contact us section of our website at www.derbyshire.police.uk/contact-us."

People can also contact the crime charity Crimestoppers without giving their name by calling 0800 555 111.